<?php
/**
 * PHPExcel
 * Copyright (c) 2006 - 2013 PHPExcel
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 * @category   PHPExcel
 * @package    PHPExcel
 * @copyright  Copyright (c) 2006 - 2013 PHPExcel (http://www.codeplex.com/PHPExcel)
 * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt    LGPL
 * @version    1.7.9, 2013-06-02
 */

/** PHPExcel root directory */
//namespace App\PhpExcel;
if (!defined('PHPEXCEL_ROOT')) {
    define('PHPEXCEL_ROOT', dirname(__FILE__) . '/');
    require(PHPEXCEL_ROOT . 'PHPExcel/Autoloader.php');
}

class PHPExcel_Lite {

    public $PHPExcel;

    public function __construct() {

        $this->PHPExcel = new PHPExcel();
    }

    public function getPHPExcel() {

        return $this->PHPExcel;
    }

    public function importExcel($fileName, $firstRowTitle = 1, $Sheet = 0) {

        if ($firstRowTitle < 0) {
            return "firstRowTitle Error";
        }

        $PHPExcel = PHPExcel_IOFactory::load($fileName);

        //获取表中的第一个工作表，如果要获取第二个，把0改为1，依次类推
        $currentSheet = $PHPExcel->getSheet($Sheet);
        //获取总列数
        $allColumn = $currentSheet->getHighestColumn();
        //获取总行数
        $allRow = $currentSheet->getHighestRow();
        //循环获取表中的数据，$currentRow表示当前行，从哪行开始读取数据，索引值从0开始
        $title = array();
        if ($firstRowTitle) {
            for ($currentColumn = 'A'; $currentColumn <= $allColumn; $currentColumn++) {
                //数据坐标
                $address = $currentColumn . $firstRowTitle;
                //读取到的数据，保存到数组$arr中
                $title[$currentColumn] = $currentSheet->getCell($address)->getValue();
            }
        }

        for ($currentRow = $firstRowTitle + 1; $currentRow <= $allRow; $currentRow++) {
            //从哪列开始，A表示第一列
            for ($currentColumn = 'A'; $currentColumn <= $allColumn; $currentColumn++) {
                //数据坐标
                $address = $currentColumn . $currentRow;
                if ($title) {
                    //读取到的数据，保存到数组$arr中
                    $arr[$currentRow][$this->getIndex($title, $currentColumn, $currentColumn)] = $currentSheet->getCell($address)->getValue();
                } else {
                    $arr[$currentRow][$currentColumn] = $currentSheet->getCell($address)->getValue();
                }
            }
        }
        return array_values($arr);
    }

    public function getIndex($arr, $key, $default = '') {

        return isset($arr[$key]) ? $arr[$key] : $default;
    }

    public function exportExcel($fileName, $data, $headArr) {

        //对数据进行检验
        if (empty($data) || !is_array($data)) {
            die("data must be a array");
        }
        //检查文件名
        if (empty($fileName)) {
            exit;
        }

        $objPHPExcel = $this->PHPExcel;

        //设置表头
        $key = ord("A");
        foreach ($headArr as $v) {
            $colum = chr($key);
            $objPHPExcel->setActiveSheetIndex(0)->setCellValue($colum . '1', $v);
            $key += 1;
        }

        $column      = 2;
        $objActSheet = $objPHPExcel->getActiveSheet();
        foreach ($data as $key => $rows) { //行写入
            $span = ord("A");
            foreach ($rows as $keyName => $value) {// 列写入
                $j = chr($span);
                $objActSheet->setCellValue($j . $column, $value);
				$objActSheet->getColumnDimension($j)->setAutoSize(true);
                $span++;
            }
            $column++;
        }

        $fileName = iconv("utf-8", "gb2312", $fileName);
        //设置活动单指数到第一个表,所以Excel打开这是第一个表
        $objPHPExcel->setActiveSheetIndex(0);
        header('Content-Type: application/vnd.ms-excel');
        header("Content-Disposition: attachment;filename=\"$fileName\"");
        header('Cache-Control: max-age=0');

        $objWriter = \PHPExcel_IOFactory::createWriter($objPHPExcel, PHPExcel_Lite::getExcelType($fileName));
        $objWriter->save('php://output'); //文件通过浏览器下载
        exit;
    }

    public static function getExcelType($pFilename) {

        // First, lucky guess by inspecting file extension
        $pathinfo = pathinfo($pFilename);

        $extensionType = NULL;
        if (isset($pathinfo['extension'])) {
            switch (strtolower($pathinfo['extension'])) {
                case 'xlsx':            //	Excel (OfficeOpenXML) Spreadsheet
                case 'xlsm':            //	Excel (OfficeOpenXML) Macro Spreadsheet (macros will be discarded)
                case 'xltx':            //	Excel (OfficeOpenXML) Template
                case 'xltm':            //	Excel (OfficeOpenXML) Macro Template (macros will be discarded)
                    $extensionType = 'Excel2007';
                    break;
                case 'xls':                //	Excel (BIFF) Spreadsheet
                case 'xlt':                //	Excel (BIFF) Template
                    $extensionType = 'Excel5';
                    break;
                case 'ods':                //	Open/Libre Offic Calc
                case 'ots':                //	Open/Libre Offic Calc Template
                    $extensionType = 'OOCalc';
                    break;
                case 'slk':
                    $extensionType = 'SYLK';
                    break;
                case 'xml':                //	Excel 2003 SpreadSheetML
                    $extensionType = 'Excel2003XML';
                    break;
                case 'gnumeric':
                    $extensionType = 'Gnumeric';
                    break;
                case 'htm':
                case 'html':
                    $extensionType = 'HTML';
                    break;
                case 'csv':
                    // Do nothing
                    // We must not try to use CSV reader since it loads
                    // all files including Excel files etc.
                    break;
                default:
                    break;
            }
            return $extensionType;
        }
    }
}

/**
 * PHPExcel
 * @category   PHPExcel
 * @package    PHPExcel
 * @copyright  Copyright (c) 2006 - 2013 PHPExcel (http://www.codeplex.com/PHPExcel)
 */
class PHPExcel {

    /**
     * Unique ID
     * @var string
     */
    private $_uniqueID;

    /**
     * Document properties
     * @var PHPExcel_DocumentProperties
     */
    private $_properties;

    /**
     * Document security
     * @var PHPExcel_DocumentSecurity
     */
    private $_security;

    /**
     * Collection of Worksheet objects
     * @var PHPExcel_Worksheet[]
     */
    private $_workSheetCollection = array();

    /**
     * Calculation Engine
     * @var PHPExcel_Calculation
     */
    private $_calculationEngine = NULL;

    /**
     * Active sheet index
     * @var int
     */
    private $_activeSheetIndex = 0;

    /**
     * Named ranges
     * @var PHPExcel_NamedRange[]
     */
    private $_namedRanges = array();

    /**
     * CellXf supervisor
     * @var PHPExcel_Style
     */
    private $_cellXfSupervisor;

    /**
     * CellXf collection
     * @var PHPExcel_Style[]
     */
    private $_cellXfCollection = array();

    /**
     * CellStyleXf collection
     * @var PHPExcel_Style[]
     */
    private $_cellStyleXfCollection = array();

    /**
     * Create a new PHPExcel with one Worksheet
     */
    public function __construct() {

        $this->_uniqueID          = uniqid();
        $this->_calculationEngine = PHPExcel_Calculation::getInstance($this);

        // Initialise worksheet collection and add one worksheet
        $this->_workSheetCollection   = array();
        $this->_workSheetCollection[] = new PHPExcel_Worksheet($this);
        $this->_activeSheetIndex      = 0;

        // Create document properties
        $this->_properties = new PHPExcel_DocumentProperties();

        // Create document security
        $this->_security = new PHPExcel_DocumentSecurity();

        // Set named ranges
        $this->_namedRanges = array();

        // Create the cellXf supervisor
        $this->_cellXfSupervisor = new PHPExcel_Style(true);
        $this->_cellXfSupervisor->bindParent($this);

        // Create the default style
        $this->addCellXf(new PHPExcel_Style);
        $this->addCellStyleXf(new PHPExcel_Style);
    }

    /**
     * Code to execute when this worksheet is unset()
     */
    public function __destruct() {

        PHPExcel_Calculation::unsetInstance($this);
        $this->disconnectWorksheets();
    }    //    function __destruct()

    /**
     * Disconnect all worksheets from this PHPExcel workbook object,
     *    typically so that the PHPExcel object can be unset
     */
    public function disconnectWorksheets() {

        $worksheet = NULL;
        foreach ($this->_workSheetCollection as $k => &$worksheet) {
            $worksheet->disconnectCells();
            $this->_workSheetCollection[$k] = null;
        }
        unset($worksheet);
        $this->_workSheetCollection = array();
    }

    /**
     * Return the calculation engine for this worksheet
     * @return PHPExcel_Calculation
     */
    public function getCalculationEngine() {

        return $this->_calculationEngine;
    }    //	function getCellCacheController()

    /**
     * Get properties
     * @return PHPExcel_DocumentProperties
     */
    public function getProperties() {

        return $this->_properties;
    }

    /**
     * Set properties
     *
     * @param PHPExcel_DocumentProperties $pValue
     */
    public function setProperties(PHPExcel_DocumentProperties $pValue) {

        $this->_properties = $pValue;
    }

    /**
     * Get security
     * @return PHPExcel_DocumentSecurity
     */
    public function getSecurity() {

        return $this->_security;
    }

    /**
     * Set security
     *
     * @param PHPExcel_DocumentSecurity $pValue
     */
    public function setSecurity(PHPExcel_DocumentSecurity $pValue) {

        $this->_security = $pValue;
    }

    /**
     * Get active sheet
     * @return PHPExcel_Worksheet
     */
    public function getActiveSheet() {

        return $this->_workSheetCollection[$this->_activeSheetIndex];
    }

    /**
     * Create sheet and add it to this workbook
     *
     * @param  int|null $iSheetIndex Index where sheet should go (0,1,..., or null for last)
     *
     * @return PHPExcel_Worksheet
     * @throws PHPExcel_Exception
     */
    public function createSheet($iSheetIndex = NULL) {

        $newSheet = new PHPExcel_Worksheet($this);
        $this->addSheet($newSheet, $iSheetIndex);
        return $newSheet;
    }

    /**
     * Check if a sheet with a specified name already exists
     *
     * @param  string $pSheetName Name of the worksheet to check
     *
     * @return boolean
     */
    public function sheetNameExists($pSheetName) {

        return ($this->getSheetByName($pSheetName) !== NULL);
    }

    /**
     * Add sheet
     *
     * @param  PHPExcel_Worksheet $pSheet
     * @param  int|null           $iSheetIndex Index where sheet should go (0,1,..., or null for last)
     *
     * @return PHPExcel_Worksheet
     * @throws PHPExcel_Exception
     */
    public function addSheet(PHPExcel_Worksheet $pSheet, $iSheetIndex = NULL) {

        if ($this->sheetNameExists($pSheet->getTitle())) {
            throw new PHPExcel_Exception("Workbook already contains a worksheet named '{$pSheet->getTitle()}'. Rename this worksheet first.");
        }

        if ($iSheetIndex === NULL) {
            if ($this->_activeSheetIndex < 0) {
                $this->_activeSheetIndex = 0;
            }
            $this->_workSheetCollection[] = $pSheet;
        } else {
            // Insert the sheet at the requested index
            array_splice($this->_workSheetCollection, $iSheetIndex, 0, array($pSheet));

            // Adjust active sheet index if necessary
            if ($this->_activeSheetIndex >= $iSheetIndex) {
                ++$this->_activeSheetIndex;
            }
        }
        return $pSheet;
    }

    /**
     * Remove sheet by index
     *
     * @param  int $pIndex Active sheet index
     *
     * @throws PHPExcel_Exception
     */
    public function removeSheetByIndex($pIndex = 0) {

        $numSheets = count($this->_workSheetCollection);

        if ($pIndex > $numSheets - 1) {
            throw new PHPExcel_Exception("You tried to remove a sheet by the out of bounds index: {$pIndex}. The actual number of sheets is {$numSheets}.");
        } else {
            array_splice($this->_workSheetCollection, $pIndex, 1);
        }
        // Adjust active sheet index if necessary
        if (($this->_activeSheetIndex >= $pIndex) && ($pIndex > count($this->_workSheetCollection) - 1)) {
            --$this->_activeSheetIndex;
        }
    }

    /**
     * Get sheet by index
     *
     * @param  int $pIndex Sheet index
     *
     * @return PHPExcel_Worksheet
     * @throws PHPExcel_Exception
     */
    public function getSheet($pIndex = 0) {

        $numSheets = count($this->_workSheetCollection);

        if ($pIndex > $numSheets - 1) {
            throw new PHPExcel_Exception("Your requested sheet index: {$pIndex} is out of bounds. The actual number of sheets is {$numSheets}.");
        } else {
            return $this->_workSheetCollection[$pIndex];
        }
    }

    /**
     * Get all sheets
     * @return PHPExcel_Worksheet[]
     */
    public function getAllSheets() {

        return $this->_workSheetCollection;
    }

    /**
     * Get sheet by name
     *
     * @param  string $pName Sheet name
     *
     * @return PHPExcel_Worksheet
     */
    public function getSheetByName($pName = '') {

        $worksheetCount = count($this->_workSheetCollection);
        for ($i = 0; $i < $worksheetCount; ++$i) {
            if ($this->_workSheetCollection[$i]->getTitle() === $pName) {
                return $this->_workSheetCollection[$i];
            }
        }

        return NULL;
    }

    /**
     * Get index for sheet
     *
     * @param  PHPExcel_Worksheet $pSheet
     *
     * @return Sheet index
     * @throws PHPExcel_Exception
     */
    public function getIndex(PHPExcel_Worksheet $pSheet) {

        foreach ($this->_workSheetCollection as $key => $value) {
            if ($value->getHashCode() == $pSheet->getHashCode()) {
                return $key;
            }
        }

        throw new PHPExcel_Exception("Sheet does not exist.");
    }

    /**
     * Set index for sheet by sheet name.
     *
     * @param  string $sheetName Sheet name to modify index for
     * @param  int    $newIndex  New index for the sheet
     *
     * @return New sheet index
     * @throws PHPExcel_Exception
     */
    public function setIndexByName($sheetName, $newIndex) {

        $oldIndex = $this->getIndex($this->getSheetByName($sheetName));
        $pSheet   = array_splice($this->_workSheetCollection, $oldIndex, 1);
        array_splice($this->_workSheetCollection, $newIndex, 0, $pSheet);
        return $newIndex;
    }

    /**
     * Get sheet count
     * @return int
     */
    public function getSheetCount() {

        return count($this->_workSheetCollection);
    }

    /**
     * Get active sheet index
     * @return int Active sheet index
     */
    public function getActiveSheetIndex() {

        return $this->_activeSheetIndex;
    }

    /**
     * Set active sheet index
     *
     * @param  int $pIndex Active sheet index
     *
     * @throws PHPExcel_Exception
     * @return PHPExcel_Worksheet
     */
    public function setActiveSheetIndex($pIndex = 0) {

        $numSheets = count($this->_workSheetCollection);

        if ($pIndex > $numSheets - 1) {
            throw new PHPExcel_Exception("You tried to set a sheet active by the out of bounds index: {$pIndex}. The actual number of sheets is {$numSheets}.");
        } else {
            $this->_activeSheetIndex = $pIndex;
        }
        return $this->getActiveSheet();
    }

    /**
     * Set active sheet index by name
     *
     * @param  string $pValue Sheet title
     *
     * @return PHPExcel_Worksheet
     * @throws PHPExcel_Exception
     */
    public function setActiveSheetIndexByName($pValue = '') {

        if (($worksheet = $this->getSheetByName($pValue)) instanceof PHPExcel_Worksheet) {
            $this->setActiveSheetIndex($this->getIndex($worksheet));
            return $worksheet;
        }

        throw new PHPExcel_Exception('Workbook does not contain sheet:' . $pValue);
    }

    /**
     * Get sheet names
     * @return string[]
     */
    public function getSheetNames() {

        $returnValue    = array();
        $worksheetCount = $this->getSheetCount();
        for ($i = 0; $i < $worksheetCount; ++$i) {
            $returnValue[] = $this->getSheet($i)->getTitle();
        }

        return $returnValue;
    }

    /**
     * Add external sheet
     *
     * @param  PHPExcel_Worksheet $pSheet      External sheet to add
     * @param  int|null           $iSheetIndex Index where sheet should go (0,1,..., or null for last)
     *
     * @throws PHPExcel_Exception
     * @return PHPExcel_Worksheet
     */
    public function addExternalSheet(PHPExcel_Worksheet $pSheet, $iSheetIndex = null) {

        if ($this->sheetNameExists($pSheet->getTitle())) {
            throw new PHPExcel_Exception("Workbook already contains a worksheet named '{$pSheet->getTitle()}'. Rename the external sheet first.");
        }

        // count how many cellXfs there are in this workbook currently, we will need this below
        $countCellXfs = count($this->_cellXfCollection);

        // copy all the shared cellXfs from the external workbook and append them to the current
        foreach ($pSheet->getParent()->getCellXfCollection() as $cellXf) {
            $this->addCellXf(clone $cellXf);
        }

        // move sheet to this workbook
        $pSheet->rebindParent($this);

        // update the cellXfs
        foreach ($pSheet->getCellCollection(false) as $cellID) {
            $cell = $pSheet->getCell($cellID);
            $cell->setXfIndex($cell->getXfIndex() + $countCellXfs);
        }

        return $this->addSheet($pSheet, $iSheetIndex);
    }

    /**
     * Get named ranges
     * @return PHPExcel_NamedRange[]
     */
    public function getNamedRanges() {

        return $this->_namedRanges;
    }

    /**
     * Add named range
     *
     * @param  PHPExcel_NamedRange $namedRange
     *
     * @return PHPExcel
     */
    public function addNamedRange(PHPExcel_NamedRange $namedRange) {

        if ($namedRange->getScope() == null) {
            // global scope
            $this->_namedRanges[$namedRange->getName()] = $namedRange;
        } else {
            // local scope
            $this->_namedRanges[$namedRange->getScope()->getTitle() . '!' . $namedRange->getName()] = $namedRange;
        }
        return true;
    }

    /**
     * Get named range
     *
     * @param  string                  $namedRange
     * @param  PHPExcel_Worksheet|null $pSheet Scope. Use null for global scope
     *
     * @return PHPExcel_NamedRange|null
     */
    public function getNamedRange($namedRange, PHPExcel_Worksheet $pSheet = null) {

        $returnValue = null;

        if ($namedRange != '' && ($namedRange !== NULL)) {
            // first look for global defined name
            if (isset($this->_namedRanges[$namedRange])) {
                $returnValue = $this->_namedRanges[$namedRange];
            }

            // then look for local defined name (has priority over global defined name if both names exist)
            if (($pSheet !== NULL) && isset($this->_namedRanges[$pSheet->getTitle() . '!' . $namedRange])) {
                $returnValue = $this->_namedRanges[$pSheet->getTitle() . '!' . $namedRange];
            }
        }

        return $returnValue;
    }

    /**
     * Remove named range
     *
     * @param  string                  $namedRange
     * @param  PHPExcel_Worksheet|null $pSheet Scope: use null for global scope.
     *
     * @return PHPExcel
     */
    public function removeNamedRange($namedRange, PHPExcel_Worksheet $pSheet = null) {

        if ($pSheet === NULL) {
            if (isset($this->_namedRanges[$namedRange])) {
                unset($this->_namedRanges[$namedRange]);
            }
        } else {
            if (isset($this->_namedRanges[$pSheet->getTitle() . '!' . $namedRange])) {
                unset($this->_namedRanges[$pSheet->getTitle() . '!' . $namedRange]);
            }
        }
        return $this;
    }

    /**
     * Get worksheet iterator
     * @return PHPExcel_WorksheetIterator
     */
    public function getWorksheetIterator() {

        return new PHPExcel_WorksheetIterator($this);
    }

    /**
     * Copy workbook (!= clone!)
     * @return PHPExcel
     */
    public function copy() {

        $copied = clone $this;

        $worksheetCount = count($this->_workSheetCollection);
        for ($i = 0; $i < $worksheetCount; ++$i) {
            $this->_workSheetCollection[$i] = $this->_workSheetCollection[$i]->copy();
            $this->_workSheetCollection[$i]->rebindParent($this);
        }

        return $copied;
    }

    /**
     * Implement PHP __clone to create a deep clone, not just a shallow copy.
     */
    public function __clone() {

        foreach ($this as $key => $val) {
            if (is_object($val) || (is_array($val))) {
                $this->{$key} = unserialize(serialize($val));
            }
        }
    }

    /**
     * Get the workbook collection of cellXfs
     * @return PHPExcel_Style[]
     */
    public function getCellXfCollection() {

        return $this->_cellXfCollection;
    }

    /**
     * Get cellXf by index
     *
     * @param  int $pIndex
     *
     * @return PHPExcel_Style
     */
    public function getCellXfByIndex($pIndex = 0) {

        return $this->_cellXfCollection[$pIndex];
    }

    /**
     * Get cellXf by hash code
     *
     * @param  string $pValue
     *
     * @return PHPExcel_Style|false
     */
    public function getCellXfByHashCode($pValue = '') {

        foreach ($this->_cellXfCollection as $cellXf) {
            if ($cellXf->getHashCode() == $pValue) {
                return $cellXf;
            }
        }
        return false;
    }

    /**
     * Check if style exists in style collection
     *
     * @param  PHPExcel_Style $pCellStyle
     *
     * @return boolean
     */
    public function cellXfExists($pCellStyle = null) {

        return in_array($pCellStyle, $this->_cellXfCollection, true);
    }

    /**
     * Get default style
     * @return PHPExcel_Style
     * @throws PHPExcel_Exception
     */
    public function getDefaultStyle() {

        if (isset($this->_cellXfCollection[0])) {
            return $this->_cellXfCollection[0];
        }
        throw new PHPExcel_Exception('No default style found for this workbook');
    }

    /**
     * Add a cellXf to the workbook
     *
     * @param PHPExcel_Style $style
     */
    public function addCellXf(PHPExcel_Style $style) {

        $this->_cellXfCollection[] = $style;
        $style->setIndex(count($this->_cellXfCollection) - 1);
    }

    /**
     * Remove cellXf by index. It is ensured that all cells get their xf index updated.
     *
     * @param  int $pIndex Index to cellXf
     *
     * @throws PHPExcel_Exception
     */
    public function removeCellXfByIndex($pIndex = 0) {

        if ($pIndex > count($this->_cellXfCollection) - 1) {
            throw new PHPExcel_Exception("CellXf index is out of bounds.");
        } else {
            // first remove the cellXf
            array_splice($this->_cellXfCollection, $pIndex, 1);

            // then update cellXf indexes for cells
            foreach ($this->_workSheetCollection as $worksheet) {
                foreach ($worksheet->getCellCollection(false) as $cellID) {
                    $cell    = $worksheet->getCell($cellID);
                    $xfIndex = $cell->getXfIndex();
                    if ($xfIndex > $pIndex) {
                        // decrease xf index by 1
                        $cell->setXfIndex($xfIndex - 1);
                    } else {
                        if ($xfIndex == $pIndex) {
                            // set to default xf index 0
                            $cell->setXfIndex(0);
                        }
                    }
                }
            }
        }
    }

    /**
     * Get the cellXf supervisor
     * @return PHPExcel_Style
     */
    public function getCellXfSupervisor() {

        return $this->_cellXfSupervisor;
    }

    /**
     * Get the workbook collection of cellStyleXfs
     * @return PHPExcel_Style[]
     */
    public function getCellStyleXfCollection() {

        return $this->_cellStyleXfCollection;
    }

    /**
     * Get cellStyleXf by index
     *
     * @param  int $pIndex
     *
     * @return PHPExcel_Style
     */
    public function getCellStyleXfByIndex($pIndex = 0) {

        return $this->_cellStyleXfCollection[$pIndex];
    }

    /**
     * Get cellStyleXf by hash code
     *
     * @param  string $pValue
     *
     * @return PHPExcel_Style|false
     */
    public function getCellStyleXfByHashCode($pValue = '') {

        foreach ($this->_cellXfStyleCollection as $cellStyleXf) {
            if ($cellStyleXf->getHashCode() == $pValue) {
                return $cellStyleXf;
            }
        }
        return false;
    }

    /**
     * Add a cellStyleXf to the workbook
     *
     * @param PHPExcel_Style $pStyle
     */
    public function addCellStyleXf(PHPExcel_Style $pStyle) {

        $this->_cellStyleXfCollection[] = $pStyle;
        $pStyle->setIndex(count($this->_cellStyleXfCollection) - 1);
    }

    /**
     * Remove cellStyleXf by index
     *
     * @param int $pIndex
     *
     * @throws PHPExcel_Exception
     */
    public function removeCellStyleXfByIndex($pIndex = 0) {

        if ($pIndex > count($this->_cellStyleXfCollection) - 1) {
            throw new PHPExcel_Exception("CellStyleXf index is out of bounds.");
        } else {
            array_splice($this->_cellStyleXfCollection, $pIndex, 1);
        }
    }

    /**
     * Eliminate all unneeded cellXf and afterwards update the xfIndex for all cells
     * and columns in the workbook
     */
    public function garbageCollect() {

        // how many references are there to each cellXf ?
        $countReferencesCellXf = array();
        foreach ($this->_cellXfCollection as $index => $cellXf) {
            $countReferencesCellXf[$index] = 0;
        }

        foreach ($this->getWorksheetIterator() as $sheet) {

            // from cells
            foreach ($sheet->getCellCollection(false) as $cellID) {
                $cell = $sheet->getCell($cellID);
                ++$countReferencesCellXf[$cell->getXfIndex()];
            }

            // from row dimensions
            foreach ($sheet->getRowDimensions() as $rowDimension) {
                if ($rowDimension->getXfIndex() !== null) {
                    ++$countReferencesCellXf[$rowDimension->getXfIndex()];
                }
            }

            // from column dimensions
            foreach ($sheet->getColumnDimensions() as $columnDimension) {
                ++$countReferencesCellXf[$columnDimension->getXfIndex()];
            }
        }

        // remove cellXfs without references and create mapping so we can update xfIndex
        // for all cells and columns
        $countNeededCellXfs = 0;
        foreach ($this->_cellXfCollection as $index => $cellXf) {
            if ($countReferencesCellXf[$index] > 0 || $index == 0) { // we must never remove the first cellXf
                ++$countNeededCellXfs;
            } else {
                unset($this->_cellXfCollection[$index]);
            }
            $map[$index] = $countNeededCellXfs - 1;
        }
        $this->_cellXfCollection = array_values($this->_cellXfCollection);

        // update the index for all cellXfs
        foreach ($this->_cellXfCollection as $i => $cellXf) {
            $cellXf->setIndex($i);
        }

        // make sure there is always at least one cellXf (there should be)
        if (empty($this->_cellXfCollection)) {
            $this->_cellXfCollection[] = new PHPExcel_Style();
        }

        // update the xfIndex for all cells, row dimensions, column dimensions
        foreach ($this->getWorksheetIterator() as $sheet) {

            // for all cells
            foreach ($sheet->getCellCollection(false) as $cellID) {
                $cell = $sheet->getCell($cellID);
                $cell->setXfIndex($map[$cell->getXfIndex()]);
            }

            // for all row dimensions
            foreach ($sheet->getRowDimensions() as $rowDimension) {
                if ($rowDimension->getXfIndex() !== null) {
                    $rowDimension->setXfIndex($map[$rowDimension->getXfIndex()]);
                }
            }

            // for all column dimensions
            foreach ($sheet->getColumnDimensions() as $columnDimension) {
                $columnDimension->setXfIndex($map[$columnDimension->getXfIndex()]);
            }

            // also do garbage collection for all the sheets
            $sheet->garbageCollect();
        }
    }

    /**
     * Return the unique ID value assigned to this spreadsheet workbook
     * @return string
     */
    public function getID() {

        return $this->_uniqueID;
    }

}
